SLM 방식으로 제작한 도재관 금속하부구조물의 변연 및 내면 적합도 평가
Evaluation of marginal and internal fit of metal copings fabricated by selective laser melting
배성령, 이하빈, 노미준, 김지환,
소속 상세정보
배성령 ( Bae Sung-Ryung ) -
이하빈 ( Lee Ha-Bin ) -
노미준 ( Noh Mi-Jun ) -
김지환 ( Kim Ji-Hwan ) -
Abstract
Purpose: To evaluate the marginal and internal fit of metal coping fabricated by a metal three-dimensional (3D) printer that uses selective laser melting (SLM).
Methods: An extraoral scanner was used to scan a die of the prepared maxillary right first molar, and the coping was designed using computer-aided design software and saved as an stereo lithography (STL) file. Ten specimens were printed with an SLM-type metal 3D printer (SLM group), and 10 more specimens were fabricated by casting the castable pat-terns output generated by a digital light processing-type resin 3D printer (casting the 3D printed resin patterns [CRP] group). The fit was measured using the silicon replica tech-nique, and 8 points (A to H) were set per specimen to measure the marginal (points A, H) and internal (points B~G) gaps. The differences among the groups were compared using the Mann-Whitney U-test (α=0.05).
Results: The mean of marginal fit in the SLM group was 69.67±18.04 μm, while in the CRP group was 117.10±41.95 μm. The internal fit of the SLM group was 95.18±41.20 μm, and that of the CRP group was 86.35±32 μm. As a result of statistical analysis, there was a sig-nificant difference in marginal fit between the SLM and CRP groups (p<0.05); however, there was no significant difference in internal fit between the SLM group and the CRP group (p>0.05).
Conclusion: The marginal and internal fit of SLM is within the clinically acceptable range, and it seems to be applicable in terms of fit.
키워드
Dental marginal adaptation; Dental internal fit; Metal three-dimensional print-ing; Resin three-dimensional printing; Selective laser melting
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